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S. E. BEEDY.

TELEPHONIU RECEIVER.

No. 266,746. Patented Oct. 3L 1882.

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UNITED STATES SETH E. BEEDY, OF FARMINGTON, MAINE, ASSIGNOR OF ONE-HALFTO JOHN J. LINSCOTT, OF SAME PLACE,

TELEPHONIC RECEIVER.

SPECIFICATION forming part of Letters Patent No. 266,746, dated October31, 1882,

Application filed June 13, 1882.

To all whom it may concern:

Be it known that I, SETH E. BEEDY, a citizen of the United States,residing at Farmington, in the county of Franklin and State of Maine,have invented new and useful Improvements in Telephonic Receivers, ofwhich the following is a specification.

My invention relates to telephone-receivers and it consists, first, inperforating the diaphragm at a point which is central with the openingof the cap; second, in a permanent magnet set in the tubular handle, andhaving a soft-iron core with a disk which is cupped or concaved upon theface next the diaphragm, and is beveled upon the opposite face to fit acorresponding formation in the spool; third, in forming the permanentmagnet of the core in two separate pieces.

Referring to the drawings, Figure 1 is a central longitudinal sectionthrough the receiver. Fig. 2 is an elevation. Fig. 3 is a detail view ofthe permanent magnet, the core being removed. Fig. 4. is a detail viewof the soft-iron core removed from the permanent magnet. Fig. 5 is aside elevation of the spool. Fig. 6 is a View of the diaphragm.

A in said drawings indicates the tubular handle of the receiver, whichis constructed substantially in the usual form.

B is the cap or ear-piece, which may be attached by cutting a femalethread upon the flange a and a male thread upon the handle, and screwingthe-parts together, or in any other suitable manner.

0 is the diaphragm, which is placed in the ear-piece and held inposition by screwing the flanged handle into the cap until it rests uponthe edge. At the central point in this diaphragm 1 form one or more thanone perforation, I), so arranged that if one perforation is used itshall be concentric with the opening in the ear-piece B, whereas ifseveral openings are formed, as shown in dotted lines, Fig. 6, theyshall be arranged concentrically to said opening and within a certainarea, hereinafter specified.

D is the magnet, which is made in the form of a straight metal barinclosed within the tubular handle. It is provided at the end nearestthe ear-piece with a soft-metal core, E, which may be adjustably unitedto the mag- (No model.)

net by screwing it into an aperture in the end, or in any other suitablemanner. At its extremity, near the diaphragm, this core has an enlargeddisk,F, ofsomewha-t greater diameter than the said opening in theear-piece, said disk being cupped or concaved upon the face adjacent tothe diaphragm, as shown at J. Upon the opposite face the disk is beveledto give it an inclined or convex surface, which approaches parallelismwith the concavity of the opposite surface.

G indicates the spool, which is mounted upon the iron core E, one of itswalls or faces being cut away concentrically with the opening in thespool wherein the disk F sits, as illustrated in Fig. 1. By thisconstruction the disk and the coil may be placed in close proximity toeach other. The wires pass from the spool through the longitudinal wallsof the handle to binding-posts (Z (Z upon its extremity.

The magnet D, with its core E, may be adjusted toward and from thediaphragm by a screw, 0, which engages with a female thread in theaperturefin the end of the magnet. An elastic cushion, I, maybeinterposed between the magnet and the end of the handle to throw themagnet toward the diaphragm when the screw 0 is withdrawn; but insteadof this cushion any suitable device may be employed which willaccomplish a similar result.

I have already described the location of the opening or openings in thediaphragm O as being concentric with the sound-opening in the ear-piece.It will also be noticed that the disk Fis so formed that its concaveface is concentric with said opening. It should befnrther noted thatwhen more than one perforation are employed they shall all be arrangedwholly within the area bounded by the periphery of said disk.

By makingthe magnet and core separately I can form the latter in diesmore easily and cheaply, and obtain a permanent magnet with a soft-ironcore, which gives much better results. Again, by beveling off the underface of the disk F and seating it in a corresponding concavity, g,(shown in Fig. 5, dotted lines,) I am enabled to bring the coil upon thebobbin G close to the extremity of the magnet, whereby I obtain muchgreater intensity of action. Finally, by concaving the face of the diskthe sound-waves are amplified and focused as they come from the disk,and in this condition are thrown upon the diaphragm immediately oppositethe central opening or openings in the diaphragm opposite the concavity,and hence are received and heard with increased volume, distinctness,and timbre.

Having thus described my invention, what I claim, and desire to secureby Letters Patent,

1. A telephone-receiver provided with a single diaphragm havin gone ormore perforations, as described, in combination with an adj nstablesoft-iron core having a concaved or cupshaped extremity next thediaphragm, and a stem which passes through the spool and into thepermanent magnet, as set forth.

2. In a telephone-receiver provided with a perforated diaphragm, thecombination, with an adjustable permanent magnet adjustably secured tothe telephone-handle at one end, the opposite end being provided with asoftiron core having a cup-shaped extremity, of

the bobbin (:r, secured to the permanent magnet and soft-iron core,substantially as set forth.

3. In a telephone-receiver having a perforated diaphragm, a soft-ironcore provided with a cupped or concaved exterior face adjacent to andlarger than the opening or openings in the diaphragm, said core beingsecured to the permanent magnet and adjustable with relation to thediaphragm, substantially as set forth.

4. The combination, with the permanent magnet and the soft-iron core, ofthe concaved disk and perforated diaphragm, as set forth.

5. In a telephonic receiver having an adjustable permanent magnet, acup-shaped detachable core adjustably secured to the permanent magnet,substantially as set forth.

In testimony WhereofI have hereunto set my hand in the presence of twosubscribing witnesses.

SETH E. BEEDY.

Witnesses:

J AMES L. N-oRRIs, ALBERT H. NORRIS.

